You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

at1-compression

This package was deleted from PyPI around 2026-06-21. Installing fails with:
$ pip3 install at1-compression ERROR: Could not find a version that satisfies the requirement at1-compression (from versions: none) ERROR: No matching distribution found for at1-compression

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-06-20/ \ at1-compression
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Or, download files manually

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0.1.0
0.1.1
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4